Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan, Republic of China.
Instrumentation Center, National Taiwan University, Taipei 10617, Taiwan, Republic of China.
Chem Commun (Camb). 2021 Apr 27;57(34):4110-4113. doi: 10.1039/d1cc01149a.
We present a first report on the detection of three different C6 conformers of cellulose in spruce, as revealed by solid-state 1H-13C correlation spectra. The breakthrough in 1H resolution is achieved by magic-angle spinning in the regime of 150 kHz. The suppression of dense dipolar network of 1H provides inverse detected 13C spectra at a good sensitivity even in natural samples. We find that the glycosidic linkages are initially more ordered in spruce than maple, but a thermal treatment of spruce leads to a more heterogeneous packing order of the remaining cellulose fibrils.
我们首次报道了在云杉中检测到三种不同构象的纤维素 C6，这是通过固态 1H-13C 相关光谱揭示的。通过在 150 kHz 范围内的魔角旋转实现了 1H 分辨率的突破。1H 的密集偶极网络的抑制即使在天然样品中也能提供良好灵敏度的反检测 13C 光谱。我们发现，糖苷键在云杉中的初始有序性比枫木高，但对云杉进行热处理会导致剩余纤维素纤维的堆积有序性更加多样化。
